<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let day = prompt("今天是星期几")
        switch (day) {
            case (day = "星期一"):
                alert("Monday")
                break
            case (furit = "星期二"):
                alert("Tuesday")
                break
            case (furit = "星期三"):
                alert("Wednesday")
                break
            case (furit = "星期四"):
                alert("Thursday")
                break
            case (furit = "星期五"):
                alert("Friday")
                break
            case (furit = "星期六"):
                alert("Saturday")
                break
            case (furit = "星期日"):
                alert("Sunday")
                break
            default:
                alert("没有")
        }
    </script>
</body>

</html>